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- PC/104 Standard Compliance: Fully compatible with the PC/104 bus architecture, supporting stackable embedded system configurations.
- 24 Digital I/O Channels: Provides 24 TTL/DTL-compatible lines divided into three 8-bit ports (Port A, Port B, Port C). Each port can be independently configured as input or output.
- Enhanced Drive Capability: Each output line can source up to 15 mA and sink up to 24 mA, allowing direct interfacing with LEDs, relays, and other TTL-level devices.
- Programmable Counter/Timer: Incorporates an 82C54 (Intel 8254-compatible) chip offering three independent 16-bit counters with six programmable modes for event counting, frequency generation, and timing control.
- Interrupt Support: Selectable interrupt request lines (IRQ 9(2), 5, 10, 11, 12, 15) with enable control and positive trigger capability.
- External Interrupt Inputs: Dedicated INTE and INTP pins allow external event triggering without continuous polling.
- Flexible Power Configuration: Jumper-selectable +12 V or ground output on connector pins for compatibility with various accessory boards.
- Accessory Compatibility: Directly interfaces with AXIOMTEK accessory boards such as AX751, AX754, AX755, and AX756 for signal conditioning, isolation, and relay control.
- Compact Form Factor: 95 mm × 90 mm PCB size suitable for embedded and space-constrained systems.
- Robust Environmental Design: Operates from 0 °C to 60 °C with non-condensing humidity up to 90%.
- 24 Digital I/O Channels: Provides 24 TTL/DTL-compatible lines divided into three 8-bit ports (Port A, Port B, Port C). Each port can be independently configured as input or output.
- Enhanced Drive Capability: Each output line can source up to 15 mA and sink up to 24 mA, allowing direct interfacing with LEDs, relays, and other TTL-level devices.
- Programmable Counter/Timer: Incorporates an 82C54 (Intel 8254-compatible) chip offering three independent 16-bit counters with six programmable modes for event counting, frequency generation, and timing control.
- Interrupt Support: Selectable interrupt request lines (IRQ 9(2), 5, 10, 11, 12, 15) with enable control and positive trigger capability.
- External Interrupt Inputs: Dedicated INTE and INTP pins allow external event triggering without continuous polling.
- Flexible Power Configuration: Jumper-selectable +12 V or ground output on connector pins for compatibility with various accessory boards.
- Accessory Compatibility: Directly interfaces with AXIOMTEK accessory boards such as AX751, AX754, AX755, and AX756 for signal conditioning, isolation, and relay control.
- Compact Form Factor: 95 mm × 90 mm PCB size suitable for embedded and space-constrained systems.
- Robust Environmental Design: Operates from 0 °C to 60 °C with non-condensing humidity up to 90%.
1. Product Overview
Product Name: AX10424
Model: AX10424
Series: PC/104 Digital I/O and Counter/Timer Modules
Article Number: AX10424
Manufacturer: AXIOMTEK Co., Ltd. (Taiwan)
The AX10424 is a compact PC/104 expansion module designed for embedded and industrial computing environments. It integrates 24 channels of TTL/DTL-compatible digital input/output (DIO) and three independent 16-bit programmable counter/timer channels based on the Intel 8254 architecture. The module conforms to the PC/104 mechanical and electrical standards, ensuring compatibility with a wide range of embedded PC systems. Its design emphasizes reliability, configurability, and ease of integration for control, measurement, and automation applications.
2. Key Features
- PC/104 Standard Compliance: Fully compatible with the PC/104 bus architecture, supporting stackable embedded system configurations.
- 24 Digital I/O Channels: Provides 24 TTL/DTL-compatible lines divided into three 8-bit ports (Port A, Port B, Port C). Each port can be independently configured as input or output.
- Enhanced Drive Capability: Each output line can source up to 15 mA and sink up to 24 mA, allowing direct interfacing with LEDs, relays, and other TTL-level devices.
- Programmable Counter/Timer: Incorporates an 82C54 (Intel 8254-compatible) chip offering three independent 16-bit counters with six programmable modes for event counting, frequency generation, and timing control.
- Interrupt Support: Selectable interrupt request lines (IRQ 9(2), 5, 10, 11, 12, 15) with enable control and positive trigger capability.
- External Interrupt Inputs: Dedicated INTE and INTP pins allow external event triggering without continuous polling.
- Flexible Power Configuration: Jumper-selectable +12 V or ground output on connector pins for compatibility with various accessory boards.
- Accessory Compatibility: Directly interfaces with AXIOMTEK accessory boards such as AX751, AX754, AX755, and AX756 for signal conditioning, isolation, and relay control.
- Compact Form Factor: 95 mm × 90 mm PCB size suitable for embedded and space-constrained systems.
- Robust Environmental Design: Operates from 0 °C to 60 °C with non-condensing humidity up to 90%.
3. Technical Specifications
Digital I/O
- Number of Channels: 24
- Configuration: TTL/DTL compatible, emulates Intel 8255 PPI Mode 0
- Port Structure: Three 8-bit ports (A, B, C); Port C can be split into upper and lower 4-bit groups
- Input Characteristics:
- Logic High Voltage: ≥ 2.0 V
- Logic Low Voltage: ≤ 0.8 V
- Logic High Input Current: ≤ 20 µA at 2.7 V
- Logic Low Input Current: ≤ –0.2 mA at 0.4 V
- Output Characteristics:
- Logic High Voltage: ≥ 2.4 V at –3 mA
- Logic Low Voltage: ≤ 0.4 V at 12 mA
- Source Current: up to –15 mA
- Sink Current: up to 24 mA
- Noise Margin: Typical hysteresis = 0.4 V
- Pull-up Resistors: Optional (≈ 4.7 kΩ) for CMOS/dry contact compatibility
Counter/Timer
- Chip Type: 82C54 (Intel 8254-compatible)
- Number of Counters: 3 × 16-bit independent counters
- Frequency Range: DC – 10 MHz
- Modes: Six programmable modes (0–5) including event counting, rate generation, square wave, and one-shot operations
- Signal Levels: TTL/DTL/CMOS compatible
Interrupts
- Available IRQ Lines: 9(2), 5, 10, 11, 12, 15
- Trigger Type: Positive edge, software enable control
Power Requirements
- Supply Voltage: +5 V DC
- Current Consumption: 200 mA typical
Physical and Environmental
- Dimensions: 95 mm × 90 mm
- Weight: 200 g
- Connectors:
- J4: 50-pin male ribbon connector (digital I/O)
- J10: 20-pin male ribbon connector (counter/timer I/O)
- Cable Type: Ribbon stripline, impedance 30 Ω – 80 Ω
- Operating Temperature: 0 °C – 60 °C
- Storage Temperature: –40 °C – 100 °C
- Humidity: 0 – 90 % RH, non-condensing
4. Functionality
The AX10424 functions as a multifunction digital I/O and timing module for embedded PC/104 systems. It provides both parallel digital interfacing and precise timing control:
- Digital I/O Operation:
Each of the three 8-bit ports can be programmed as input or output. Port C can be split into two 4-bit subports for mixed-direction configurations. The module emulates the 8255 PPI Mode 0 interface, allowing straightforward software control through standard I/O port addressing.
- Counter/Timer Operation:
The integrated 82C54 chip provides three programmable counters. Each counter can operate independently in one of six modes, supporting event counting, frequency division, pulse generation, and timing delays.
- Interrupt Handling:
External interrupt inputs (INTE, INTP) can trigger system interrupts on selectable IRQ lines, enabling event-driven processing without CPU polling.
- Applications:
- Industrial process control and monitoring
- Event and frequency counting
- Pulse width and period measurement
- Waveform and pulse generation
- Baud rate generation for serial communication
- Digital signal sensing and actuation
- Compatibility:
Fully compatible with PC/104 bus systems and accessory boards (AX751, AX754, AX755, AX756).
5. Components & Accessories
Included Items:
- AX10424 main board
- Four × 3 mm screws
- Four × 6 mm bronze spacers
- AS59099 DAC Driver CD
Optional Accessories:
- AX751: Screw terminal board for all digital I/O channels; includes 1 m (3.3 ft) 50-pin cable.
- AX754: 24-channel opto-isolated digital input panel for signal conditioning; includes 1 m cable.
- AX755: Combination board with 8 SPDT relay outputs and 16 opto-isolated digital inputs; includes 1 m cable.
- AX756: 24-channel SPDT relay output board; includes 1 m cable.
Connectors:
- J4 (50-pin): Digital I/O interface; provides ports A, B, C signals, +5 V, ground, and optional +12 V pins (via J9 jumper).
- J10 (20-pin): Counter/timer interface; provides CLK, GATE, OUT signals for counters 0–2, +5 V, +12 V, GND, 10 MHz reference, INTE, INTP.
6. Installation & Setup
Requirements:
- PC/104-compatible host system with available stack position
- +5 V DC power supply
- Proper ESD protection during handling
Installation Steps:
1. Power off the host system and disconnect all power sources.
2. Remove the system cover and access the PC/104 stack.
3. Align the AX10424 with the PC/104 bus connectors of the top module.
4. Insert the module carefully, ensuring correct pin alignment.
5. Secure the board using the provided 6 mm spacers and 3 mm screws.
6. Connect the required cables to J4 (digital I/O) and J10 (counter/timer).
7. Configure the base address DIP switch (SW1) to an unused I/O address (default = 220h).
8. Set interrupt jumpers (J2–J8) to the desired IRQ line if external interrupts are used.
9. Configure J9 jumper for +12 V or GND output on pins 2 and 4 of J4.
10. Replace the system cover and power on the system.
Configuration Options:
- Base Address: 200h – 3F8h (8 I/O addresses used)
- Interrupt Selection: IRQ 9(2), 5, 10, 11, 12, 15 via jumpers J2–J8
- Power Output Selection (J9):
- Pins 2 & 4 = GND (default)
- Pins 2 & 4 = +12 V (for relay or opto-isolated boards)
Resistor Packs (RP1–RP3):
Optional 4.7 kΩ pull-up packs for input ports to prevent floating inputs.
7. Performance & Capabilities
- Digital I/O Throughput: Direct port access via I/O instructions enables high-speed digital control.
- Counter/Timer Frequency: Up to 10 MHz input frequency per channel.
- Timing Resolution: 16-bit counters provide fine timing granularity for precise event measurement.
- Output Drive Strength: 24 mA sink, 15 mA source per line.
- Interrupt Latency: Hardware interrupt capability minimizes CPU overhead.
- Power Efficiency: Typical consumption = 200 mA @ +5 V.
- Limitations:
- TTL-level I/O only (no direct high-voltage interfacing without conditioning).
- Requires external isolation for noisy or high-voltage environments (use AX754/AX755/AX756).
8. Standards & Compliance
- Bus Standard: PC/104 (ISA-compatible, 16-bit AT bus)
- Electrical Interface: TTL/DTL/CMOS compatible
- Mechanical Specification: Conforms to PC/104 95 mm × 90 mm form factor
- Environmental Compliance: Designed for industrial temperature and humidity ranges
- Regulatory: Manufactured under AXIOMTEK quality standards; conforms to general embedded hardware safety and ESD handling guidelines
9. Additional Information
Warranty & Support:
AXIOMTEK provides standard warranty coverage for manufacturing defects. Users should contact authorized distributors or AXIOMTEK technical support for RMA or service inquiries.
Maintenance:
- Handle the board using ESD precautions.
- Keep connectors clean and free of debris.
- Verify jumper and DIP switch settings before installation.
- Use optional resistor packs or isolation boards in electrically noisy environments.
Software & Programming:
- Programmable through direct I/O port access using languages such as C, BASIC, or assembly.
- Example base address: 220h; ports A, B, C mapped to +4, +5, +6 offsets.
- Control register at +7 offset defines port direction.
- Counter/timer registers at base +0 to +3 for counters 0–2 and control word.
Documentation & Updates:
- User’s Manual: AX10424 3 Channel Counter/Timer & 24 Bit DIO Module User’s Manual, 1st Edition (June 1994).
- AXIOMTEK reserves the right to modify specifications without notice.
Manufacturer Contact:
AXIOMTEK Co., Ltd.
Taiwan, R.O.C.
Website: [www.axiomtek.com](https://www.axiomtek.com)
Summary
The AXIOMTEK AX10424 is a robust, PC/104-compliant digital I/O and counter/timer module engineered for embedded and industrial control applications. It combines 24 TTL/DTL digital I/O lines with three programmable 16-bit counters, offering flexible interfacing, precise timing, and interrupt-driven event handling. With its compact 95 × 90 mm form factor, configurable base address, and compatibility with AXIOMTEK’s accessory boards, the AX10424 serves as a versatile solution for data acquisition, automation, and signal control tasks in embedded PC systems.
Product Name: AX10424
Model: AX10424
Series: PC/104 Digital I/O and Counter/Timer Modules
Article Number: AX10424
Manufacturer: AXIOMTEK Co., Ltd. (Taiwan)
The AX10424 is a compact PC/104 expansion module designed for embedded and industrial computing environments. It integrates 24 channels of TTL/DTL-compatible digital input/output (DIO) and three independent 16-bit programmable counter/timer channels based on the Intel 8254 architecture. The module conforms to the PC/104 mechanical and electrical standards, ensuring compatibility with a wide range of embedded PC systems. Its design emphasizes reliability, configurability, and ease of integration for control, measurement, and automation applications.
2. Key Features
- PC/104 Standard Compliance: Fully compatible with the PC/104 bus architecture, supporting stackable embedded system configurations.
- 24 Digital I/O Channels: Provides 24 TTL/DTL-compatible lines divided into three 8-bit ports (Port A, Port B, Port C). Each port can be independently configured as input or output.
- Enhanced Drive Capability: Each output line can source up to 15 mA and sink up to 24 mA, allowing direct interfacing with LEDs, relays, and other TTL-level devices.
- Programmable Counter/Timer: Incorporates an 82C54 (Intel 8254-compatible) chip offering three independent 16-bit counters with six programmable modes for event counting, frequency generation, and timing control.
- Interrupt Support: Selectable interrupt request lines (IRQ 9(2), 5, 10, 11, 12, 15) with enable control and positive trigger capability.
- External Interrupt Inputs: Dedicated INTE and INTP pins allow external event triggering without continuous polling.
- Flexible Power Configuration: Jumper-selectable +12 V or ground output on connector pins for compatibility with various accessory boards.
- Accessory Compatibility: Directly interfaces with AXIOMTEK accessory boards such as AX751, AX754, AX755, and AX756 for signal conditioning, isolation, and relay control.
- Compact Form Factor: 95 mm × 90 mm PCB size suitable for embedded and space-constrained systems.
- Robust Environmental Design: Operates from 0 °C to 60 °C with non-condensing humidity up to 90%.
3. Technical Specifications
Digital I/O
- Number of Channels: 24
- Configuration: TTL/DTL compatible, emulates Intel 8255 PPI Mode 0
- Port Structure: Three 8-bit ports (A, B, C); Port C can be split into upper and lower 4-bit groups
- Input Characteristics:
- Logic High Voltage: ≥ 2.0 V
- Logic Low Voltage: ≤ 0.8 V
- Logic High Input Current: ≤ 20 µA at 2.7 V
- Logic Low Input Current: ≤ –0.2 mA at 0.4 V
- Output Characteristics:
- Logic High Voltage: ≥ 2.4 V at –3 mA
- Logic Low Voltage: ≤ 0.4 V at 12 mA
- Source Current: up to –15 mA
- Sink Current: up to 24 mA
- Noise Margin: Typical hysteresis = 0.4 V
- Pull-up Resistors: Optional (≈ 4.7 kΩ) for CMOS/dry contact compatibility
Counter/Timer
- Chip Type: 82C54 (Intel 8254-compatible)
- Number of Counters: 3 × 16-bit independent counters
- Frequency Range: DC – 10 MHz
- Modes: Six programmable modes (0–5) including event counting, rate generation, square wave, and one-shot operations
- Signal Levels: TTL/DTL/CMOS compatible
Interrupts
- Available IRQ Lines: 9(2), 5, 10, 11, 12, 15
- Trigger Type: Positive edge, software enable control
Power Requirements
- Supply Voltage: +5 V DC
- Current Consumption: 200 mA typical
Physical and Environmental
- Dimensions: 95 mm × 90 mm
- Weight: 200 g
- Connectors:
- J4: 50-pin male ribbon connector (digital I/O)
- J10: 20-pin male ribbon connector (counter/timer I/O)
- Cable Type: Ribbon stripline, impedance 30 Ω – 80 Ω
- Operating Temperature: 0 °C – 60 °C
- Storage Temperature: –40 °C – 100 °C
- Humidity: 0 – 90 % RH, non-condensing
4. Functionality
The AX10424 functions as a multifunction digital I/O and timing module for embedded PC/104 systems. It provides both parallel digital interfacing and precise timing control:
- Digital I/O Operation:
Each of the three 8-bit ports can be programmed as input or output. Port C can be split into two 4-bit subports for mixed-direction configurations. The module emulates the 8255 PPI Mode 0 interface, allowing straightforward software control through standard I/O port addressing.
- Counter/Timer Operation:
The integrated 82C54 chip provides three programmable counters. Each counter can operate independently in one of six modes, supporting event counting, frequency division, pulse generation, and timing delays.
- Interrupt Handling:
External interrupt inputs (INTE, INTP) can trigger system interrupts on selectable IRQ lines, enabling event-driven processing without CPU polling.
- Applications:
- Industrial process control and monitoring
- Event and frequency counting
- Pulse width and period measurement
- Waveform and pulse generation
- Baud rate generation for serial communication
- Digital signal sensing and actuation
- Compatibility:
Fully compatible with PC/104 bus systems and accessory boards (AX751, AX754, AX755, AX756).
5. Components & Accessories
Included Items:
- AX10424 main board
- Four × 3 mm screws
- Four × 6 mm bronze spacers
- AS59099 DAC Driver CD
Optional Accessories:
- AX751: Screw terminal board for all digital I/O channels; includes 1 m (3.3 ft) 50-pin cable.
- AX754: 24-channel opto-isolated digital input panel for signal conditioning; includes 1 m cable.
- AX755: Combination board with 8 SPDT relay outputs and 16 opto-isolated digital inputs; includes 1 m cable.
- AX756: 24-channel SPDT relay output board; includes 1 m cable.
Connectors:
- J4 (50-pin): Digital I/O interface; provides ports A, B, C signals, +5 V, ground, and optional +12 V pins (via J9 jumper).
- J10 (20-pin): Counter/timer interface; provides CLK, GATE, OUT signals for counters 0–2, +5 V, +12 V, GND, 10 MHz reference, INTE, INTP.
6. Installation & Setup
Requirements:
- PC/104-compatible host system with available stack position
- +5 V DC power supply
- Proper ESD protection during handling
Installation Steps:
1. Power off the host system and disconnect all power sources.
2. Remove the system cover and access the PC/104 stack.
3. Align the AX10424 with the PC/104 bus connectors of the top module.
4. Insert the module carefully, ensuring correct pin alignment.
5. Secure the board using the provided 6 mm spacers and 3 mm screws.
6. Connect the required cables to J4 (digital I/O) and J10 (counter/timer).
7. Configure the base address DIP switch (SW1) to an unused I/O address (default = 220h).
8. Set interrupt jumpers (J2–J8) to the desired IRQ line if external interrupts are used.
9. Configure J9 jumper for +12 V or GND output on pins 2 and 4 of J4.
10. Replace the system cover and power on the system.
Configuration Options:
- Base Address: 200h – 3F8h (8 I/O addresses used)
- Interrupt Selection: IRQ 9(2), 5, 10, 11, 12, 15 via jumpers J2–J8
- Power Output Selection (J9):
- Pins 2 & 4 = GND (default)
- Pins 2 & 4 = +12 V (for relay or opto-isolated boards)
Resistor Packs (RP1–RP3):
Optional 4.7 kΩ pull-up packs for input ports to prevent floating inputs.
7. Performance & Capabilities
- Digital I/O Throughput: Direct port access via I/O instructions enables high-speed digital control.
- Counter/Timer Frequency: Up to 10 MHz input frequency per channel.
- Timing Resolution: 16-bit counters provide fine timing granularity for precise event measurement.
- Output Drive Strength: 24 mA sink, 15 mA source per line.
- Interrupt Latency: Hardware interrupt capability minimizes CPU overhead.
- Power Efficiency: Typical consumption = 200 mA @ +5 V.
- Limitations:
- TTL-level I/O only (no direct high-voltage interfacing without conditioning).
- Requires external isolation for noisy or high-voltage environments (use AX754/AX755/AX756).
8. Standards & Compliance
- Bus Standard: PC/104 (ISA-compatible, 16-bit AT bus)
- Electrical Interface: TTL/DTL/CMOS compatible
- Mechanical Specification: Conforms to PC/104 95 mm × 90 mm form factor
- Environmental Compliance: Designed for industrial temperature and humidity ranges
- Regulatory: Manufactured under AXIOMTEK quality standards; conforms to general embedded hardware safety and ESD handling guidelines
9. Additional Information
Warranty & Support:
AXIOMTEK provides standard warranty coverage for manufacturing defects. Users should contact authorized distributors or AXIOMTEK technical support for RMA or service inquiries.
Maintenance:
- Handle the board using ESD precautions.
- Keep connectors clean and free of debris.
- Verify jumper and DIP switch settings before installation.
- Use optional resistor packs or isolation boards in electrically noisy environments.
Software & Programming:
- Programmable through direct I/O port access using languages such as C, BASIC, or assembly.
- Example base address: 220h; ports A, B, C mapped to +4, +5, +6 offsets.
- Control register at +7 offset defines port direction.
- Counter/timer registers at base +0 to +3 for counters 0–2 and control word.
Documentation & Updates:
- User’s Manual: AX10424 3 Channel Counter/Timer & 24 Bit DIO Module User’s Manual, 1st Edition (June 1994).
- AXIOMTEK reserves the right to modify specifications without notice.
Manufacturer Contact:
AXIOMTEK Co., Ltd.
Taiwan, R.O.C.
Website: [www.axiomtek.com](https://www.axiomtek.com)
Summary
The AXIOMTEK AX10424 is a robust, PC/104-compliant digital I/O and counter/timer module engineered for embedded and industrial control applications. It combines 24 TTL/DTL digital I/O lines with three programmable 16-bit counters, offering flexible interfacing, precise timing, and interrupt-driven event handling. With its compact 95 × 90 mm form factor, configurable base address, and compatibility with AXIOMTEK’s accessory boards, the AX10424 serves as a versatile solution for data acquisition, automation, and signal control tasks in embedded PC systems.
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AX10424.pdf
Manual
